Diagnostic Method

Measure the pressure values when the enable conditions are established, and perform diagnosis by calculating those results.

1. Label the intake manifold pressure value as PMOF1, which is observed when enable conditions are established, and set the EGR target step to 50 steps (nearly full open).
2. Label the intake manifold pressure value as PMON, which is observed after one second has passed since EGR target step was set to 50 steps (when the enable conditions were established), and set the EGR target step to 0.
3. Label the intake manifold pressure as PMOF2, which is observed after one second has passed since EGR target step was set to 0 (after two seconds have passed since the enable conditions were established).
   • Abnormality Judgment 

     Judge as NG when the following conditions are established.

Time Needed for Diagnosis:  1 time

Malfunction Indicator Light Illumination:  Illuminates when malfunction occurs in 2 continuous driving cycles.

Fig 1: Malfunction Indicator Light Timing Chart

Courtesy of SUBARU OF AMERICA, INC.

• Normality Judgment 

  Judge as OK and clear the NG if the following conditions are established.

Time Needed for Diagnosis:  1 time